Here in Arizona, the combination of heat and drought takes its toll on tires. They are more prone to drying out and cracking. The spare wheel is outdoors and never gets shade. I bought this cover to protect my replacement part from UV damage. It's cheap insurance to ensure the spare tire can be used when it's time to change tires. I chose denim. It's plastic, not denim like your jeans, but it doesn't look shiny or cheap. I have 255 x 70 R x 17 Nitto Terra Grappler At tires and the size 30-32β¦